The Transformer,audio Frequency, cataloged under National Stock Number 5950-01-239-7977, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Lockheed Martin Sippican, Inc. Div Communication Division. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-01-239-7977 |
| Primary Part Number | 1889G-1 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Lockheed Martin Sippican, Inc. Div Communication Division |
| Status | ACTIVE |
| Inclosure Type | FULLY INCLOSED |
| Body Outside Diameter | 1.091 INCHES MAXIMUM IN |
| Mounting Method | TERMINAL SINGLE GROUP |
| Winding Function and Quantity | 1 PRIMARY AND 2 SECONDARY SINGLE COMPONENT |
| Winding Shielding Method | INTERNAL SHIELD BROUGHT OUT TO TERMINAL SINGLE COMPONENT |
| Maximum Operating Temp | 85.0 CELSIUS DEGC |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 10.0 KILOHERTZ NOMINAL SINGLE COMPONENT |
| Terminal Type and Quantity | 7 PIN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1889G-1 PRIMARY | Lockheed Martin Sippican, Inc. Div Communication Division (USA) |
NSN 5950-01-239-7977 is a Transformer,audio Frequency, manufactured by Lockheed Martin Sippican, Inc. Div Communication Division, classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-01-239-7977 has 1 manufacturer part number on file: 1889G-1 (Lockheed Martin Sippican, Inc. Div Communication Division).
Key specifications for 1889G-1: Inclosure Type: FULLY INCLOSED; Body Outside Diameter: 1.091 INCHES MAXIMUM IN; Mounting Method: TERMINAL SINGLE GROUP; Overall Length: 0.938 INCHES MAXIMUM IN. 9 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.